
if(typeof(_e) == "undefined") {
_e = {}
}

_e["contextmenu"] = function(selClass,menuitems,handler) {

  "use strict";


  function clickInsideElement( e, className ) {
    var el = e.srcElement || e.target;

    if ( el.classList.contains(className) ) {
      return el;
    } else {
      while ( el = el.parentNode ) {
        if ( el.classList && el.classList.contains(className) ) {
          return el;
        }
      }
    }

    return false;
  }

  /**
   * Get's exact position of event.
   *
   * @param {Object} e The event passed in
   * @return {Object} Returns the x and y position
   */
  function getPosition(e) {
    var posx = 0;
    var posy = 0;

    if (!e) var e = window.event;

    if (e.pageX || e.pageY) {
      posx = e.pageX;
      posy = e.pageY;
    } else if (e.clientX || e.clientY) {
      posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
      posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
    }

    return {
      x: posx,
      y: posy
    }
  }


  var contextMenuClassName = "context-menu";
  var contextMenuItemClassName = "context-menu__item";
  var contextMenuLinkClassName = "context-menu__link";
  var contextMenuActive = "context-menu--active";

  var taskItemClassName = selClass;
  var taskItemInContext;

  var clickCoords;
  var clickCoordsX;
  var clickCoordsY;

  var menu = document.createElement("nav")
  menu.className = "context-menu"
  var ul = document.createElement("ul")
  ul.className = "context-menu__items"
  for(var i=0;i<menuitems.length;i++){
    var li = document.createElement("li")
    li.className = "context-menu__item"
    li.innerHTML = menuitems[i]
    ul.appendChild(li)
  }
  menu.appendChild(ul)
  document.body.appendChild(menu)



  var menuItems = menu.querySelectorAll(".context-menu__item")
  var menuState = 0;
  var menuWidth;
  var menuHeight;
  var menuPosition;
  var menuPositionX;
  var menuPositionY;

  var windowWidth;
  var windowHeight;

  /**
   * Initialise our application's code.
   */
  function init() {
    contextListener();
    clickListener();
    keyupListener();
    resizeListener();
  }

  /**
   * Listens for contextmenu events.
   */
  function contextListener() {
    document.addEventListener( "contextmenu", function(e) {
      taskItemInContext = clickInsideElement( e, taskItemClassName );

      if ( taskItemInContext ) {
        e.preventDefault();
        toggleMenuOn();
        positionMenu(e);
      } else {
        taskItemInContext = null;
        toggleMenuOff();
      }
    });
  }

  /**
   * Listens for click events.
   */
  function clickListener() {
    document.addEventListener( "click", function(e) {
      var clickeElIsLink = clickInsideElement( e, contextMenuLinkClassName );

      if ( clickeElIsLink ) {
        e.preventDefault();
        menuItemListener( clickeElIsLink );
      } else {
        var button = e.which || e.button;
        if ( button === 1 ) {
          toggleMenuOff();
        }
      }
    });
  }

  /**
   * Listens for keyup events.
   */
  function keyupListener() {
    window.onkeyup = function(e) {
      if ( e.keyCode === 27 ) {
        toggleMenuOff();
      }
    }
  }

  /**
   * Window resize event listener
   */
  function resizeListener() {
    window.onresize = function(e) {
      toggleMenuOff();
    };
  }

  /**
   * Turns the custom context menu on.
   */
  function toggleMenuOn() {
    if ( menuState !== 1 ) {
      menuState = 1;
      menu.classList.add( contextMenuActive );
    }
  }

  /**
   * Turns the custom context menu off.
   */
  function toggleMenuOff() {
    if ( menuState !== 0 ) {
      menuState = 0;
      menu.classList.remove( contextMenuActive );
    }
  }

  /**
   * Positions the menu properly.
   *
   * @param {Object} e The event
   */
  function positionMenu(e) {
    clickCoords = getPosition(e);
    clickCoordsX = clickCoords.x;
    clickCoordsY = clickCoords.y;

    menuWidth = menu.offsetWidth + 4;
    menuHeight = menu.offsetHeight + 4;

    windowWidth = window.innerWidth;
    windowHeight = window.innerHeight;

    if ( (windowWidth - clickCoordsX) < menuWidth ) {
      menu.style.left = windowWidth - menuWidth + "px";
    } else {
      menu.style.left = clickCoordsX + "px";
    }

    if ( (windowHeight - clickCoordsY) < menuHeight ) {
      menu.style.top = windowHeight - menuHeight + "px";
    } else {
      menu.style.top = clickCoordsY + "px";
    }
  }

  /**
   * Dummy action function that logs an action when a menu item link is clicked
   *
   * @param {HTMLElement} link The link that was clicked
   */
  function menuItemListener( link ) {
  handler(link,taskItemInContext)
    toggleMenuOff();
  }

  /**
   * Run the app.
   */
  init();

}
